US4780117A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Time release cooling system
Assignee: Individual
•
Filing: 1987-04-14
•
Granted: 1988-10-25
•
Expires: 2007-04-14
Abstract
Abstract Extended period cooling packs are provided by employing reaction mixtures of coated particulate matter and a liquid reactant, where the liquid reactant reacts with the particulate matter in an endothermic reaction. The coating acts to slow the rate of reaction between the reactants, so as to extend the period of cooling.
Inventors
- 👤 Thomas P. Lahey
- 👤 Steven F. Abo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:30
CPC Classifications
A; A61; A61F; A61F7/00; A61F7/10; A61F7/106; C; C09; C09K; C09K5/00; C09K5/02; C09K5/06; C09K5/066; F; F25; F25D; F25D5/00; F25D5/02; A61F7/02; A61F2007/0268; A61F2007/0276
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
75 words
An extended lifetime cold pack comprising: a container having first and second compartments separated by a barrier capable of being opened to provide communication between said first and second compartments: said first compartment containing solid reactant particles coated with a reaction delaying penetrable coating, said coating being at least partially soluble or swellable in a liquid reactant; and said second compartment containing said liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 2
Dependent Claim
75 words
An extended lifetime cold pack comprising: a container having first and second compartments separated by a barrier capable of being opened to provide communication between said first and second compartments: said first compartment containing solid reactant particles coated with a reaction delaying penetrable coating, said coating being at least partially soluble or swellable in a liquid reactant; and said second compartment containing said liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 3
Dependent Claim
24 words
A cold pack according to claim 1, wherein said solid reactant is soluble in said liquid reactant and has a negative heat of solution.
Claim 4
Dependent Claim
15 words
A cold pack according to claim 1, wherein said solid reactant is an inorganic salt.
Claim 5
Dependent Claim
14 words
A cold pack according to claim 3, wherein said inorganic salt is ammonium salt.
Claim 6
Dependent Claim
33 words
A cold pack according to claim 1, wherein said penetrable coating is a polymer coating, and said liquid reactant is an aqueous alkaline solution in which said particles and said polymer are soluble.
Claim 7
Dependent Claim
82 words
An extended lifetime cold pack comprising: a container having first and second compartments separated by a barrier capable of being opened to provide communication between said first and second compartments: said first compartment containing solid ammonium salt reactant particles coated with a reaction delaying carboxylic acid containing polymer coating, said coating being at least partially soluble in an aqueous alkaline liquid reactant; and said second compartment containing said aqueous alkaline liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 8
Dependent Claim
82 words
An extended lifetime cold pack comprising: a container having first and second compartments separated by a barrier capable of being opened to provide communication between said first and second compartments: said first compartment containing solid ammonium salt reactant particles coated with a reaction delaying carboxylic acid containing polymer coating, said coating being at least partially soluble in an aqueous alkaline liquid reactant; and said second compartment containing said aqueous alkaline liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 9
Dependent Claim
30 words
A cold pack according to claim 6, wherein said ammonium salt is ammonium nitrate or sulfate and said polymer has a KOH number in the range of 50 to 200.
Claim 10
Dependent Claim
27 words
A cold pack according to claim 7, wherein said KOH number is in the range of 165 to 195 and said polymer is a styrene-maleic anhydride copolymer.
Claim 11
Dependent Claim
30 words
A cold pack according to claim 7, wherein said KOH number is in the range of 165 to 195 and said polymer is an acrylic or methacrylic polymer or copolymer.
Claim 12
Dependent Claim
22 words
A cold pack according to claim 6, wherein said particles have a size in the range of 10 to 500 U.S. mesh.
Claim 13
Dependent Claim
21 words
A cold pack according to claim 10, wherein said particle size is in the range of 50 to 200 U.S. mesh.
Claim 14
Dependent Claim
71 words
An extended lifetime cold pack comprising: a container comprising a sealed pouch and a rupturable sealed bag within said sealed pouch: said pouch containing solid ammonium salt reactant particles coated with a reaction delaying carboxylic acid containing polymer coating, said coating being at least partially soluble in an aqueous alkaline liquid reactant; and said bag containing said aqueous alkaline liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 15
Dependent Claim
71 words
An extended lifetime cold pack comprising: a container comprising a sealed pouch and a rupturable sealed bag within said sealed pouch: said pouch containing solid ammonium salt reactant particles coated with a reaction delaying carboxylic acid containing polymer coating, said coating being at least partially soluble in an aqueous alkaline liquid reactant; and said bag containing said aqueous alkaline liquid reactant which reacts with said solid reactant in an endothermic reaction.
Claim 16
Dependent Claim
46 words
Coolant particles comprising an ammonium salt having a negative heat of solution in water coated with a carboxylic acid containing polymer having a KOH number in the range of 50 to 200, wherein said polymer is from about 0.2 to 10 weight percent of said particles.
Claim 17
Dependent Claim
46 words
Coolant particles comprising an ammonium salt having a negative heat of solution in water coated with a carboxylic acid containing polymer having a KOH number in the range of 50 to 200, wherein said polymer is from about 0.2 to 10 weight percent of said particles.
Claim 18
Dependent Claim
14 words
Particles according to claim 13, wherein said ammonium salt is ammonium nitrate or sulfate.
Claim 19
Dependent Claim
22 words
Particles according to claim 14, wherein said particles are of a mesh size in the range of 50 to 200 U.S. mesh.
Claim 20
Dependent Claim
13 words
Particles according to claim 14, wherein said polymer is a styrene-maleic anhydride copolymer.
Claim 21
Dependent Claim
16 words
Particles according to claim 14, wherein said polymer is an acrylic or methacrylic polymer or copolymer.
Claim 22
Dependent Claim
12 words
Particles according to claim 14, wherein said polymer is a cresol-formaldehyde polymer.
Claim 23
Dependent Claim
73 words
A method for cooling a site at a temperature greater than about ambient temperature, said method comprising: combining particles according to claim 13 with an aqueous solution in a container conforming to said site to be cooled; and applying said container to said site, whereby the endothermic reaction of said particles with said solution lowers the temperature of said solution below ambient temperature by at least 10° C. for at least 5 minutes.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-25 | 1992-04-25 | 1992-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-25 | 1996-04-25 | 1996-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-25 | 2000-04-25 | 2000-10-25 | $7700.00 | Window Closed / Lapsed |